Opacity maps and VRayEnvironment fog

[F801]

Hi @damaggio & @Zdravko.Keremidchiev

Simplified scene attached. I'd love to know why opacity maps aren't working with fog.

Thanks in advance.

[damaggio]

Please someone test his scene, I won’t be available.

[Zdravko.Keremidchiev]

Disattacing the Marble texture from the EnvironmentFog seems to fix the issue. That's on a first glans I will check further and get back to you.

[F801]

Disattacing the Marble texture from the EnvironmentFog seems to fix the issue. That's on a first glans I will check further and get back to you.

Thanks @Zdravko.Keremidchiev. Disconnecting the marble texture doesn't fix the problem for me. Any other suggestions?

[Zdravko.Keremidchiev]

This is a very specific issue which happens only in that fall off region of the Box- environmentFog where it seems to sample the Environment override fog before the box fog in the opacity area. I'll report this issue in our bug tracking system but I can't give you a time frame for this fix. For now, as a workaround, I would suggest recreating those weeds as a geometry. This could be done with splines.

[Zdravko.Keremidchiev]

Another easier and faster workaround will be to use displacement with Water level. For that purpose, you will need to convert the Alpha to RGB, feed it in a displacement node that you apply to the plane, add divisions to the plane geometry and set a proper water level so the background will disappear which will leave only the branches out.